Watertube boiler



Jan. 6, 1931. c. u. SAVOYE ET AL 1,788,207

WATER TUBE} BOILER Filed March 16, 1926 2 Sheets-Sheet l M INVENTORS BY W r A TTO/f/VEKS' Jan; 6, 1931. c. U. SAVOYE ET AL 1,783,207

WATER TUBE BOILER Filed March 16, 1926 2 Sheets-Sheefi 2 HM 5.1, WWW

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UNETEQ STATES Parser easier;

CHARLES U.

JERSEY, JERSEY, A. COBCPORA'EIQN SAVOYE, 0F HAGKENSACK, AND EDWARD J. KERR, 0F WESTFIELD, NEW ASSIGNURS T0 TEE BABCOCK & WILCOX CQMPANY, 0F BAYONNE, NEW

GE NEW JERSEY WATEE'EUBE BOILER Application filed new. it, rose. Serial no. eases.

This invention relates to a boiler of the Stirling type that is provided with a-number of upper steam and water drums connected by banks of tubes to a mud drum, the up er drums being also connected in series with each other.

The invention will be understood from the description in connection with the accompanyin drawings, in which Fig. 1 1s a section t rough a boiler illustrating the invention; Fig. 2 is a section on an enlarged scale along the line 22 of Fig. l and Fig. 3 is a similar section along the line 3--? of Fig. l.

l-leretofore; in operating boilers of this type, it has been ties become concentrated in the water, either soluble impurities, such as soluble salts, for example, or suspended impurities, such as matter, for example, troubles have-arisen due to priming. iound'that concentration of impurities in the water causes the specific gravity of the combined steam and water circulating banks of tubes and the upper and lower drums to decrease, thereby causthe level of water in the drums to be higher than that indicated by the water gauge. With very high concentration of impurities, the water level in the steam and water drums rises suficiently to cause the water to passthrough the steam circulators between the upper drums, and even in some instances to rise high enough to pass into the steam outlet from the steam space of the drum that leads to the steam mains. This tendency has been especially noticeable when the total cross-sectional area of the circulators connecting the front and middle drums, was greater than the total cross-sectional area of the circulators connecting the middle and rear drums. On acto be necessary steam and water in the front triangle of tubes between the front and middle upper drunisand the mud drum, it was thought to have more water circulators between the front and middle drums than between the middle and rear drums. We have found, however, that with such an found that when impurr. somewhat, priming resulted it has been arrangement, the water level is raised in the rear drum, from the steam space of which the steam pipe leads to the steam main, apparently because the fluids were carried over from the front drum to the middle drum faster than the pressure could be transmitted from the middle to the rear drum, which caused a difierential pressure between the middlev and rear drum, with greater ressure in the middle drum. in raising the water level in the rear drum to balance the differential pressure and consequently raising the level in the rear drum so near the steam pipe outlet that as soon as concentration of impurities increased and water was carried into the steam mains with the steam. We have found that this objection can be overcome and boilers of this t pe can be satisfactorily operated, even wit high concentration of impurities in the water, by restricting the flow oi fluids between the front and middle drums as compared with the flow between the middle and rear drums. We have found that the ratio of the total area of the connectors between the middle and rear drums to the total area of the connec-.

tors between the front and middle drums should be more than 1: l, and the total area of the connectors between the middle and rear drums should preferably be considerably greater than that between the front and middle drums.

We have also iound that the proportion ot the total cross-sectional. area oi the circulators between the in comparison to the volume of either one bit the drums. Most satisfactory results have so far been obtained by making? the cross-see tional area in square feet of the circulators between the "front and middle drums amount to not more than about ,f th of the volume in cubic feet of one of the drums to which the circulators are connected. The restriction of the areas of the circulators to this extent or greater appears to provide the proper resistance of flow between the front and middle drums to prevent the objectionable rise ct water level in the rear drum, especially the total cross-sectional area oi the circuits lhis resulted hit drums should be quite small tors between the middle and rear drums is not so restricted. c

In the drawings, reference character 5 indicates the furnace of a boiler that comprises a mud drum 6, provided with a blow-oil pipe 7, and upper steam and water drums 8, 9 and 10,.the drum 6 being connected to the drum 8 by a bank of tubes 11, to the drum 9 by a bank of tubes 12, and to the drum 10 by a bank of tubes 13. A few of the tubes of the rear bank of tubes are extended and bent forwardly to connect to the drum 9, as shown at 14:.

The front drum 8 is connected by steam circulators 15 and water circulators 16 to the middle drum 9, and the middle drum 9 is connected by means of the steam circulators 1'2 to the rear drum 10. A bafie for properly directing the hot gases from the furnace is provided at 18 on the front bank of tubes 11, a baiile 19 on the row of tubes 16, a bafie 20 at the rear of the bank of tubes 12, a baflle 21 between the banks of tubes 11 and 12, a bafile 22 on the upper ends ofthe tubes 14 and a baffle 23 between the bank of tubes 13 and the rear side of the boiler casing. An outlet 24; for waste gases is provided with a damper 25, and an outlet 26 for steam is shown at the top of the drum 10. Feed water may be introduced into the mud drum 6 or at any other convenient place. I

In the particular illustration of the invention, as most clearly shown in Figs. 2 and 3, the distance between water circulating tubes 16 is four times as great as the distance between tubes in rows of the bank of tubes 11, and the distance between the steam circulating tubes 15 is one-half as great as the dis tance between the water circulating tubes, thus providing twice as many steam circulating tubes 15 as water circulating tubes 16. The distance between steam circulating tubes 17 is the same as that between tubes in the rows of the banks 11, 12 or 13, so that when tubes of the same size are used, the total crosssectional area of the steam circulating tubes 17 will be approximately 1 rd times as much as the'combined total cross-sectional area of the steam circulating tubes 15 and the water circulating tubes 16. We have found that this ratio of cross-sectional areas of the circulating tubes greatly decreases the troubles that arise when impurities become concentrated in the water. The invention is not, however, restricted to this particular ratio, as we have found that whenever the total cross-sectional area of the tubes between the front and middle drums is less than that of the circulators between the middle and rear drums, the restricted flow of fluids between the front and middle drums has a tendency to prevent rise of the water level in the rear drum, and enables boilers of this type to be operated without priming, as. much as they would do when the concentration of impurities occur in the water with boilers provided with the usual proportion of circulators between the upper drums. It is to be understood that the proportion of steam circulators 15 to water circulators 16 can be varied and that these tubes can be disposedin more than one row, instead of one row, as illustrated in the drawings, and that efi'ects similar to those described may be obtained by changing the sizes of the tubes instead of changing the number of tubes to obtain the correct ratio of cross-sectional area between front tubes and the rear tubes.

We claim:

1. In a steam boiler having front, middle and rear steam and water drums, each connected to a mud drum by a bank of tubes, circulators between the front and middle steam and water drums, and circulators between the middle and rear steam and water drums, some of the circulators between adjacent drums being steam circulators the total cross-sectional area of said circulators between the middle and rear drums being greater than that of said circulators between the front and middle drums, and a steam outlet from said rear drum.

2. In a steam boiler having front, middle and rear steam and water drums, each connected to a mud drum by a bank of tubes, circulators between the front and middle steam and water drums, and circulators between the middle and rear steam and Water drums, some of the circulators between adjacent drums being steam circulators said circulators all being the same size and the number of said circulators between the front and middle drums being less than the number of said circulators between the rear and middle drums, and a steam outlet from said rear drum,

3. In a steam. boiler having front, middle and rear steam and water drums, each connected to a mud drum by a bank of tubes, both steam and water circulators between the front and middle steam and water drums. steam circulators between the middle and rear steam and water drums, the total area of said last named steam circulators being greaterthan the total steam and water circulators, and a steam outlet from said rear drum.

area of said first named 4. in a steam boiler. having fro'nt, middle and rear steam and water drums, each connected to a mud drum by a bank of tubes, tubes connecting the steam spaces of the front and middle steam and Water drums, tubes connecting the Water spaces of said drums, tubes connecting only the steam spaces of the middle and rear steam and Water drums, the total area of the tubes connecting said middle and rear drums being greater than'the total area of the tubes connecting said front and middle drums, and a steam outlet from said rear drum CHARLES U. SAVOYE. HOWARD J. KERR.

DISOLAI MEIR ,207.O'harles U. Savoye, Hackensack, and Howard J. Kerr, WATERTUBE BOILER. Patent dated January 6, 1931. 3, 1932, by the assignee, The Babcock d2; Wilcox Company.

Hereby disclaims claims 1 and 2 of said Letters Patent which are in the following Words, to wit:

1. In a steam connected to a mu steam and water water drums, some 0 the total cross-sectional area of said circulators between the mi being greater than that of said circulators betw and a steam outlet from said rear drum.

2. In a steam boiler having front, middle and connected to a mud drum by a bank of tubes, middle steam an and water drums, some 0 circulators, said circulators between the front and middle drums between the rear and middle drums, and

[Ojficial Gazette July 5, 1932.]

1,788 Westfield, N. J.

rear steam and water drums, each boiler having front, middle and ators between the front and middle d drum by a bank of tubes, circul rear steam and water drums, each circulators between the front and between the middle and rear steam adjacent drums being steam all being the same slze and the number of said circulators being less than the number of said circulators a steam outlet from said rear drum.

Disclaimer filed June 

